First, you need to get a browser with WebGL, as well
as a copy of node.js and git. Once you have
all of that set up, you can install the workshop using npm, which
is included with node:

npm install -g shader-school

After that completes, you should be able to run the workshopper with the command:

shader-school

The script will ask you if you want to create an answer directory, press y to
accept. This will populate your current directory with shader files for you to
edit for each lesson – hopefully, it should also automatically open your web
browser but if it doesn't you can find the workshop menu on
http://localhost:12492/.